High Speed Dual Fuel Direct Injection Engines With Advanced EGR And Injection Strategies To Reduce The Carbon Dioxide Emissions

高速双燃料直喷发动机，具有先进的 EGR 和喷射策略，可减少二氧化碳排放

• 批准号: EP/H050388/1
• 负责人: Andrew Clarke
• 金额: $ 18.94万
• 依托单位: Loughborough University
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2010
• 资助国家: 英国
• 起止时间: 2010 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FH050388%2F1
• 关键词: Speed; Dual; Fuel; Direct; Injection

This project intends to demonstrate the potential of using advanced natural gas dual fuel light-duty diesel engines to significantly reduce engine out CO2. This type of engine ingests a fresh charge of air and a quantity of gaseous fuel simultaneously to produce a lean premixed charge. This lean charge is then compressed and near the end of the compression stroke a small quantity of diesel fuel (the pilot fuel) is injected into the cylinder. After a delay period, this pilot diesel fuel then ignites and both the pilot diesel fuel and the lean mixture of gaseous fuel and air combust. By retaining a high compression ratio, thermal efficiencies similar to or higher than conventional diesel engines can be realised at high loads. The proposed work employs an existing research engine at Loughborough University, and this engine will be converted to run on dual fuel using methane as the gaseous fuel. The barrier to the current deployment of dual-fuelling in light-duty engines is a result of the higher engine speeds required for these smaller engines, which result in temporally shorter combustion events. This is a concern for dual-fuel combustion, which typically has a slower combustion than conventional diesel because of its premixed nature and relatively low flame propagation rates. This proposal aims to demonstrate that, through the use of hot exhaust-gas recirculation (EGR) and multiple diesel injections, the dual-fuel combustion rate can be increased to meet the requirements of light-duty diesel engines.Currently the light duty diesel engine sector emit 35MT CO2 per year. If all light-duty diesel vehicles in the UK were converted to dual-fuel natural gas, CO2 emissions could be reduced by up to 7 MT/year. For initial deployment in fleet applications, light-duty dual-fuelled vehicles would reduce CO2 emissions by 20% while reducing fuelling costs; even the cost of installing a fuel delivery system would pay-back in approximately 5 years. These impacts, once the technology has been demonstrated, should be of interest to operators of fleets of light-duty delivery vehicles as well as to major automotive companies.

该项目旨在展示使用先进的天然气双燃料轻型柴油发动机显著减少发动机二氧化碳排放的潜力。这种类型的发动机同时吸入新鲜的空气和一定量的气体燃料，以产生稀薄的预混合燃料。然后压缩这种稀薄的燃料，在压缩行程接近尾声时，向气缸中注入少量的柴油(先导燃料)。在延迟一段时间后，这种试点柴油然后点燃，试点柴油和稀薄的气态燃料和空气混合物都会燃烧。通过保持高压缩比，可以在高负荷下实现与传统柴油发动机相似或更高的热效率。这项拟议的工作使用了拉夫堡大学现有的一台研究发动机，该发动机将改装为使用甲烷作为气体燃料的双燃料发动机。目前在轻型发动机中部署双燃料发动机的障碍是因为这些较小的发动机需要更高的发动机速度，这导致燃烧事件暂时缩短。这是双燃料燃烧的一个问题，由于其预混性质和相对较低的火焰传播率，双燃料燃烧通常比传统柴油燃烧慢。该方案旨在证明，通过使用热废气再循环(EGR)和多次柴油喷射，可以提高双燃料燃烧率，以满足轻型柴油机的要求。目前，轻型柴油机部门每年排放35MT二氧化碳。如果英国所有轻型柴油车都改用双燃料天然气，二氧化碳排放量最多可减少7公吨/年。对于车队应用的初步部署，轻型双燃料汽车将减少20%的二氧化碳排放，同时降低燃料成本；即使是安装燃料输送系统的成本也将在大约5年内收回。一旦该技术被证明，这些影响应该会引起轻型运输车辆车队的运营商以及主要汽车公司的兴趣。

项目成果

An experimental study into the effect of the pilot injection timing on the performance and emissions of a high-speed common-rail dual-fuel engine

• DOI: 10.1177/0954407013506180
• 发表时间: 2014-02
• 期刊: Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering
• 作者: J. Rimmer;Stephen Johnson;A. Clarke